[QTI] Restoring a published channel loses the questions of its units #6261

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Overview

restore_channel recreates assessment items only for exercise nodes. A unit (a topic with UNIT modality) publishes its questions as a QTI package, so a restored unit has no questions and is no longer a unit.

Complexity: Medium
Target branch: unstable

Context

• Publish treats a UNIT topic with assessment items as having assessments and writes its QTI package:

  studio/contentcuration/contentcuration/utils/publish.py

  Lines 277 to 290 in f65cb93

  	def has_assessments(node):
  	"""Check if a node should have its assessment items published.
  	Returns True for EXERCISE nodes and TOPIC nodes with UNIT modality
  	that have assessment items.
  	"""
  	if node.kind_id == content_kinds.EXERCISE:
  	return True
  	if node.kind_id == content_kinds.TOPIC:
  	options = node.extra_fields.get("options", {}) if node.extra_fields else {}
  	if options.get("modality") == modalities.UNIT:
  	# Only return True if the UNIT has assessment items
  	return node.assessment_items.filter(deleted=False).exists()
  	return False

• Restore calls create_assessment_items only for content_kinds.EXERCISE:

  studio/contentcuration/contentcuration/utils/import_tools.py

  Lines 284 to 292 in f65cb93

  	if kind == content_kinds.TOPIC:
  	create_nodes(
  	cursor, target_id, node, indent=indent + 1, download_url=download_url
  	)
  	elif kind == content_kinds.EXERCISE:
  	create_assessment_items(
  	cursor, node, indent=indent + 1, download_url=download_url
  	)
  	create_files(cursor, node, indent=indent + 1, download_url=download_url)

• On f65cb9388, a published unit with one QTI item, restored with import_channel: zero assessment items, extra_fields is {}, and the node keeps the published qti_zip file.

The Change

• Restore should recreate a unit's questions from its QTI package and keep it a unit.

How to Get There

• Publish a channel holding a unit with at least one question.
• Run manage.py restore_channel <channel_id> --download-url <studio url>.
• Open the restored unit in the editor.

Acceptance Criteria

• A restored unit has the same questions, in the same order, as the published unit.
• A restored unit has UNIT modality and its completion criteria.
• Republishing the restored channel publishes the unit's QTI package built from the restored questions.
• import_tools tests cover restoring a unit.

AI usage

Claude Code found this during an automated self-review of the #6211 branch, reproduced it by publishing and restoring a channel in a scratch test, and drafted this issue.